The Hubsan X4 quadcopter is a tiny, cheap copter with enough power to do flips, enough smarts to stay level and pointing right, and enough tough to drop from 50 foot onto grass without damage. It flies for ten minutes or so and recharges from USB. The separately available spares package include copious spare blades, a spare shell and a spare battery.
It's cheap (under £30), includes a remote control and is an absolute blast to fly. It can handle quite a fresh wind and is fast enough that it's best fun outdoors, though it appears that people more skilled than I can also fly it indoors. Without hitting things.
BTW, important hint: connect the power when the copter is on a level surface. If you don't, it's impossible to fly.
Hubsan X4 H107 R/C Micro Quad Copter 2.4GHZ [Amazon UK]
The Hubsan X4 H107 Quadcopter Crash Pack [Amazon UK]
Hubsan X4 H107 R/C Micro Quad Copter 2.4GHZ [Amazon US]
The Hubsan X4 H107 Quadcopter Crash Pack [Amazon US]